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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
A new approch to sepiolite dispersion by treatment with ionic liquids
AbstractThe possibility of sepiolite disaggregation is a challenge to enhance significantly its performance and extend its application. In this direction, this work introduces the treatment of sepiolite (Sep) with three different ionic liquid (IL). The used ionic liquids were 1-methyl-3-butylimidazolium bis(trifluoromethanesulfonyl) imide (BMImTf2N), 1-methyl-3-octylimidazolium bis(trifluoromethanesulfonyl) imide (OMImTf2N) and 1-methyl-3- dodecylimidazolium bis(trifluoromethanesulfonyl) imide (DMImTf2N). The influence on structural, thermal properties and morphology in Sep treated with IL were evaluated using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TG), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), N2 sorption measurements, 29Si nuclear magnetic resonance (29Si NMR) and zeta potential. Sepiolite structure was preserved for all the samples treated with ionic liquids. FTIR and XRD results show that BMImTf2N substitutes water molecules coordinated to Mg+2 more efficiently. Thermogravimetric analysis indicated that the interaction between Sep and IL delayed the release of water. From these data, it was also possible to confirm the presence of 5 mass% of IL in all samples. FESEM and TEM images demonstrated more disaggregated Sep fibers with IL, especially the samples treated with BMImTf2N. This fact is attributed to the immobilization of ionic liquid on Sep tunnels, which is coherent with 29Si NMR analyses. The potential applications of these modified sepiolites are as reinforcing agent for polymers, template for nanostructured materials and support for catalysts.
Graphical abstract
HighlightsThis work is a new approach of sepiolite disaggregation by treatment with ionic liquids.Some ionic liquids substitute water molecule in the Sep structure.Thermal analysis proves that there are interactions between sepiolite and ionic liquids.BMImTf2N produced the best results for the sepiolite disaggregation.
A new approch to sepiolite dispersion by treatment with ionic liquids
AbstractThe possibility of sepiolite disaggregation is a challenge to enhance significantly its performance and extend its application. In this direction, this work introduces the treatment of sepiolite (Sep) with three different ionic liquid (IL). The used ionic liquids were 1-methyl-3-butylimidazolium bis(trifluoromethanesulfonyl) imide (BMImTf2N), 1-methyl-3-octylimidazolium bis(trifluoromethanesulfonyl) imide (OMImTf2N) and 1-methyl-3- dodecylimidazolium bis(trifluoromethanesulfonyl) imide (DMImTf2N). The influence on structural, thermal properties and morphology in Sep treated with IL were evaluated using Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), thermogravimetric analysis (TG), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), N2 sorption measurements, 29Si nuclear magnetic resonance (29Si NMR) and zeta potential. Sepiolite structure was preserved for all the samples treated with ionic liquids. FTIR and XRD results show that BMImTf2N substitutes water molecules coordinated to Mg+2 more efficiently. Thermogravimetric analysis indicated that the interaction between Sep and IL delayed the release of water. From these data, it was also possible to confirm the presence of 5 mass% of IL in all samples. FESEM and TEM images demonstrated more disaggregated Sep fibers with IL, especially the samples treated with BMImTf2N. This fact is attributed to the immobilization of ionic liquid on Sep tunnels, which is coherent with 29Si NMR analyses. The potential applications of these modified sepiolites are as reinforcing agent for polymers, template for nanostructured materials and support for catalysts.
Graphical abstract
HighlightsThis work is a new approach of sepiolite disaggregation by treatment with ionic liquids.Some ionic liquids substitute water molecule in the Sep structure.Thermal analysis proves that there are interactions between sepiolite and ionic liquids.BMImTf2N produced the best results for the sepiolite disaggregation.
A new approch to sepiolite dispersion by treatment with ionic liquids
de Lima, Juliana A. (Autor:in) / Camilo, Fernanda F. (Autor:in) / Faez, Roselena (Autor:in) / Cruz, Sandra A. (Autor:in)
Applied Clay Science ; 143 ; 234-240
22.03.2017
7 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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